Addax (Addax nasomaculatus) are considered one of the rarest antelopes on earth, with an estimated population of <100 individuals in the wild. We assessed the distribution and occurrence of this species from field surveys collected by the Sahara Conservation Fund over a 7-year period (2008-2014). Our results provide insight into the factors contributing to species occurrence and are guiding field surveys to areas that have the potential to support small and geographically isolated populations. We incorporated field-derived variables of vegetation cover with remote sensing measures of vegetation productivity (NDVI - Normalized Difference Vegetation Index) and surface roughness (derived from SRTM - Shuttle Radar Topography Mission). Models were fit in a generalized linear regression framework to evaluate and predict addax occurrence.